Cisco SFP+ Copper Twinax Cable - Direct attach cable - SFP+ to SFP+ - 23 ft - twinaxial - for Cisco 16, 8; Catalyst ESS9300; Nexus 22XX, 55XX, 7000, 93180, 93XX; UCS 61XX, C4200. Cisco SFP+ Copper Twinax cables are suitable for very short distances. Twinax cables offer a highly cost-effective way to connect within racks and across adjacent racks.